I've tried PicoPDF and largely pleased with it but I attempted to split the pages in a PDF of 25K and although the split function worked each of the split files had a size of 25k. No size reduction. This defeats the purpose of splitting - a necessary action to place the file(s) on a web page.
At present I have the free version but happy to upgrade if it does a better job of the split.
Is it me or a function of the latest but free version.